1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.command;
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3 |
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4 | import static org.openstreetmap.josm.tools.I18n.trn;
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5 |
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6 | import java.util.Collection;
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7 | import java.util.HashMap;
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8 | import java.util.LinkedList;
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9 | import java.util.Map;
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10 |
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11 | import javax.swing.JLabel;
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12 |
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13 | import org.openstreetmap.josm.data.coor.EastNorth;
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14 | import org.openstreetmap.josm.data.coor.LatLon;
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15 | import org.openstreetmap.josm.data.osm.Node;
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16 | import org.openstreetmap.josm.data.osm.OsmPrimitive;
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17 | import org.openstreetmap.josm.data.osm.visitor.AllNodesVisitor;
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18 | import org.openstreetmap.josm.tools.ImageProvider;
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19 |
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20 | /**
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21 | * Abstract class with common services for nodes rotation and scaling commands.
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22 | *
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23 | * @author Olivier Croquette <ocroquette@free.fr>
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24 | */
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25 | public abstract class TransformNodesCommand extends Command {
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26 |
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27 | /**
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28 | * The nodes to transform.
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29 | */
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30 | protected Collection<Node> nodes = new LinkedList<Node>();
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31 |
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32 | /**
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33 | * Small helper for holding the interesting part of the old data state of the
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34 | * nodes.
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35 | */
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36 | public static class OldState {
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37 | LatLon latlon;
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38 | EastNorth eastNorth;
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39 | boolean modified;
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40 | }
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41 |
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42 | /**
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43 | * List of all old states of the nodes.
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44 | */
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45 | protected Map<Node, OldState> oldStates = new HashMap<Node, OldState>();
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46 |
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47 | /**
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48 | * Stores the state of the nodes before the command.
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49 | */
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50 | protected void storeOldState() {
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51 | for (Node n : this.nodes) {
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52 | OldState os = new OldState();
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53 | os.latlon = new LatLon(n.getCoor());
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54 | os.eastNorth = n.getEastNorth();
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55 | os.modified = n.isModified();
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56 | oldStates.put(n, os);
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57 | }
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58 | }
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59 |
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60 | /**
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61 | * Creates a TransformNodesObject.
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62 | * Find out the impacted nodes and store their initial state.
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63 | */
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64 | public TransformNodesCommand(Collection<OsmPrimitive> objects) {
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65 | this.nodes = AllNodesVisitor.getAllNodes(objects);
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66 | storeOldState();
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67 | }
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68 |
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69 | /**
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70 | * Handling of a mouse event (e.g. dragging event).
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71 | * @param currentEN the current world position of the mouse
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72 | */
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73 | public abstract void handleEvent(EastNorth currentEN);
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74 |
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75 | /**
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76 | * Implementation for the nodes transformation.
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77 | * No parameters are given here, you should handle the user input in handleEvent()
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78 | * and store it internally.
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79 | */
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80 | protected abstract void transformNodes();
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81 |
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82 | /**
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83 | * Finally apply the transformation of the nodes.
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84 | * This is called when the user is happy with the current state of the command
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85 | * and its effects.
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86 | */
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87 | @Override
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88 | public boolean executeCommand() {
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89 | transformNodes();
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90 | flagNodesAsModified();
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91 | return true;
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92 | }
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93 |
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94 | /**
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95 | * Flag all nodes as modified.
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96 | */
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97 | public void flagNodesAsModified() {
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98 | for (Node n : nodes) {
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99 | n.setModified(true);
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100 | }
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101 | }
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102 |
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103 | /**
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104 | * Restore the state of the nodes from the backup.
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105 | */
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106 | @Override
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107 | public void undoCommand() {
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108 | for (Node n : nodes) {
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109 | OldState os = oldStates.get(n);
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110 | n.setCoor(os.latlon);
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111 | n.setModified(os.modified);
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112 | }
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113 | }
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114 |
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115 | @Override
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116 | public void fillModifiedData(Collection<OsmPrimitive> modified, Collection<OsmPrimitive> deleted, Collection<OsmPrimitive> added) {
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117 | }
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118 |
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119 | @Override
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120 | public Collection<? extends OsmPrimitive> getParticipatingPrimitives() {
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121 | return nodes;
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122 | }
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123 |
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124 | @Override
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125 | public JLabel getDescription() {
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126 | return new JLabel(trn("Transform {0} node", "Transform {0} nodes", nodes.size(), nodes.size()), ImageProvider.get("data", "node"), JLabel.HORIZONTAL);
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127 | }
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128 |
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129 | /**
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130 | * Get the nodes with the current transformation applied.
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131 | */
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132 | public Collection<Node> getTransformedNodes() {
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133 | return nodes;
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134 | }
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135 |
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136 | /**
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137 | * Get the center of the nodes under modification.
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138 | * It's just the barycenter.
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139 | */
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140 | public EastNorth getNodesCenter() {
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141 | EastNorth sum = new EastNorth(0,0);
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142 |
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143 | for (Node n : nodes ) {
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144 | EastNorth en = n.getEastNorth();
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145 | sum = sum.add(en.east(), en.north());
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146 | }
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147 | return new EastNorth(sum.east()/this.nodes.size(), sum.north()/this.nodes.size());
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148 |
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149 | }
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150 | }
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